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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c2fdb540deae10a6e4d8ee7fefc6a66c2987cb0010f219dacfe569a72a696a' 
  AND token = 'sdH2Nj5iflWcRwf6G7oAfZ4PzviA7BS9C6g74GccGqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}